Four Marines killed in Camp Pendleton explosion

Four Marines were killed Wednesday during an operation to clear a range of unexploded ordnance at Camp Pendleton in Southern California, a Marine official said.
The accident happened at 11 a.m. PST during a range maintenance operation at the San Diego County coastal base.
The Marines were clearing the range of unexploded ordnance, and it was not a live firing range, said a Marine official with knowledge of the incident who spoke on condition of anonymity because he was not authorized to speak publicly.
The identities of the dead were withheld pen